kern/99758: chown/chmod pty slave side in kernel

Wojciech A. Koszek wkoszek at
Fri Jul 7 15:00:46 UTC 2006

The following reply was made to PR kern/99758; it has been noted by GNATS.

From: "Wojciech A. Koszek" <wkoszek at>
To: Atsuo Ohki <ohki at>
Cc: Robert Watson <rwatson at>, freebsd-gnats-submit at,
        freebsd-bugs at
Subject: Re: kern/99758: chown/chmod pty slave side in kernel
Date: Fri, 7 Jul 2006 16:56:43 +0000

 On Fri, Jul 07, 2006 at 08:39:29PM +0900, Atsuo Ohki wrote:
 > I writes:
 > > Robert Watson writes:
 > >> ...
 > >> The tty_pts implementation in 7-CURRENT does the same, except more so, by 
 > >> forcing revocation of the pty on last close.  Unfortunately, this triggers 
 > >> bugs in devfs.  Your help in getting the 7.x pts implementation up and
 > >> running would be much appreciated.  Take a look at src/sys/kern/tty_pts.c.
 > > 
 > >  Thank you for interested in my patch.
 > > 
 > >  I don't have a machine to run 7-current now,
 >  Now I have a machine running 7-current (cvs tag HEAD).
 >  Could you give me a pointer to how to trigger bugs in devfs
 >  releated with pts implementation?
 Sure. I'm willing to hear more about your changes and patches! To reproduce
 problems I've seen, try to download Peter Wemm's stress suite, compile it,
 and run PTY code. As I recall, after unpacking stress2.tgz you'll have script and pty<some_extension>. You run it by typing: ./run
 ./pty<some_extension_maybe_conf>. Try to switch to other virtual terminal
 and login.
 For debugging stuff, where I liked to put printf()s and KASSERTs here and
 there, I used window(1), because it doesn't bomp you with tons of function
 calls, and creates (AFAICT) 2 vTTYs.
 Let me know if you find something,
 Wojciech A. Koszek
 wkoszek at

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